Crossword Genius

Retort from Scrooge is sweet (6)

Ross

I believe the answer is:

humbug

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'is sweet' is the definition.
(boiled sweet)

I cannot understand how the rest of the clue works.

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(Other definitions for humbug that I've seen before include "talk that's deceptive" , "Peppermint sweet - deception" , "Pretentious talk or boiled sweet" , "It's stuff and nonsense about the sweet" , "Baloney" .)

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